Microcephaly
Definition and Diagnostic Criteria
- Fetal microcephaly is defined as:
- Head circumference >2SD below mean or
- Below the 3rd centile for gestational age
Inheritance and Familial Factors
- Controversies about optimal reference charts and ethnic adaptations
- Fetal charts differ from gestational-age adjusted postnatal charts
- Fetal head circumference charts are not sex-specific
Outcome Based on Severity
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